Multiple-friction-disk device.



i C. T. HENDERSON. MULTIPLE FRICTION DISK DEVICE.

APPLICATION HLED I'tB I, I9I3- Patented May 14, 1918.

2 SHEET$SHEET I- aim/"mow C. T. HE ERSON.

MULTIPLE F DISK CE.

APPLICATI FEB. 1 l3.

Patented Mayl l, 1918.

2 SHEETS-SHEET 2.

UNITED STATES PATENT OFFICE.

CLARK T. HENDERSON, OF MILWAUKEE, WISCONSIN, ASSIGNOB, 'IBY MESNE ASSIGN mars, TO THE CUTLER-HAMMER MEG. 00., OF MILWAUKEE, WISCONSIN,A CORPO- BL'IION OF WISCONSIN.

mmLE-EBIGTION-DISK DEVICE.

To all whom it may concern:

Be it known that I, CLARK T. Hnnonnson, a citizen of the United States, residing at Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented new and useful Improvements in Multi le-Friction- Disk Devlces, of which the fo lowing is a full, clear concise, and exact description, reference e' had to the accompanying drawing, forming a part of this specification.

My invention relates to improvements in multiple disk friction devices. It is particularl ap licable to multiple friction disk. bra es, a though not limited to such a use thereof. 7

It has among its objects to provide for the ventilation of the disks to prevent undue heating thereof.

It has for a further object to provide magnetic means for relieving the pressure on the disks and in addition exerting a magnetic pull upon certain of the disks to separate the same from the others. I

It also has'various other objects and advantages which will hereinafter appear.

For the purpose of clearly and fully disclosing my invention I shall describe the brake structure illustrated in the accompanying drawing, which embodies my invention in one form. It is, of course, apparent that certain features of my invention are applicable to other uses and that the structure illustrated is susceptible of modification without departing from the scope of my invention. p p

In the drawings,

Figure 1 is an elevation of the brake structure. v

Fig. 2 is another elevation of structure sectioned on line 2-2, Fig. 1;

Figs. 3 and 4 comprise a plan and edge view of one disk; an

Fig. 5 is a plan view of the armature of the releasing ma et.

The structure 1 lustrated COIHPI'ISGS a huh I 1' adapted to be attached to the ob'ect to be Specification of Letters Iatent.

are adapted to be relieved of the pressure of said spring by an electromagnet 7 through the attraction thereby of the late 6. I

T e disks 3 are of ordinary construction, comprising metallic disks havin friction rings 8 secured on one or both si es thereof according to their position, the outside disks being rovided with a single friction ring while t e intermediate disk or disks are provided with friction rings on opposite sides thereof.

The disks 4, however, are of a novel design, bein' of such construction as to permit free circu ation of air therethrough. As best illustrated in Figs. 2, 3 and 4, the disks 4 each comprise two annular plates separated by radial spacers 9 to form between said Patented May 14, 1918.

Application filed February 1, 1918. Serial No. 745,719.

plates radial extending air passages. The 1 two lates and their spacers may, of course,

be ormed as ,a unitary structure and in practice are preferably so formed. As illustrated, each of the disks 4 is provided with six spacers, but of course the number of spacers may be varied as desired. The

spacers are preferably of small cross seo- I tional area to provide large ventilating passages without unduly increasing the thlck- I in each of. the disks 4 and a corresponding 4 number of keyways in the hub 1. These keyways and the keys 11 for locking the hub anddisks 4 against relative rotation are best illustrated in Fi 1. The disks 4 are, of course, free to side longitudinally of the keys 11. In practice, the circulation of air through the ventilatin passages in the disks 4 may be provided 7 near their inner peri hery or by reducing the diameter of the hu between the keys 11. The latter construction is preferable and is illustrated in Fi 1. This construction provides for three large the hub and the disks 4, and, as the stationas I r by perforating the disks 4 ary frame is of an 0 en construction around its periphery a co circulation of air through the dlsks 4 is insured. The several disks 4 are of the same'construction whereby a circulation ofair is obtained between the adjacent faces of each adjacent pair of openings 12 between stationary disks 3. This rovides for thorough ventilation of the rake and conse quently avoids overheatingor any undesirable heating of the friction parts. The advantages of this construction will of course be obvious to one skilled in the art,

The stationary frame 2 is of a very simple construction, the same comprising two rings 13 and 14: connected by webs 1'5. lnpractice it is preferably formed as an integral structure. The rin 13 is formed on diametrically opposite si es with perforated ears or lugs 13 for attachment thereof to the desired support. The friction disks 3 are secured within the frame by four pins 16 which fit in registerin notches in the outer peripheries of the dis is and the inner peripheries of the rings 13 and 14.

The magnet structure 7, which may in practice be of any suitable form, is secured to the rinp 14: of the frame 2 by bolts 17,

i said bolts avin fitted thereon spacing col= tween the In s 20 and the en said disk w' 1 be attracted away from the lars 18 for retaining said magnet frame in a spaced relation with said ring 14:. The bolts 17 also support the plate 6, which is acted upon by the spring 5 and which constitutes the armature of the magnet 7. This plate is provided, on diametrically opposite sides, with perforated lugs 19 through which the bolts 17 and their spacing collars 18 pass, thereby supporting the'plate in such a manner as to allow the same a lateral movement, or in other words, a movement longitudinally of the bolts. The plate 6 has portions bearing against an outside brake disk 3 and the spring 5 exerts a pressure upon said plate in a direction .to press the disks together, thereby causing said disks to exert a braking effect. The magnet, on the other hand, exerts a magnetic pull on the plate 6 in opposition to the spring 5, thereby relieving the pressure on the disks and releasing the brake.

The magnet 7 also magnetically attracts the end disk 3 away from the other disks. This attraction is provided for by maintaining an air gap between the armature plate 6 and the outer pole 7 of the magnet when the armature plate is attracted. This causes a leakage of the magnetic flux from the outer pole 7 of the magnet through the bolts 17, which are of magnetic material, and thence through the end disk 3 to the lugs 20 on the armature plate 6, the bushings between the bolts 17 and the plate 6 being of non-magnetic material to cause the flux to take the path described. The stray flux which passes through the end disk 3 is, of course, weak, but it is concentrated to such an extent at the points of en a ement beisk 3 that remaining disks. The remaining disks will then uickly space themselves. This pro= vides or a quick release of the brake.

naedeii What T claim as new and desire to secure by Letters Patent is 1. In a multiple friction disk device, in combination, a frame, a shaft, two sets of friction disks, one set being locked to the shaft, the other set being locked to the frame, the disks being spaced from the shaft for air space, certain of said disks being provided with radial ventilating passages communicating with said s ace, and the frame having outlets to permit free discharge of air from the passages, a pressure device carried by said frame to eflect frictional engagement of said disks and an electromagnet fixed to and supported by said frame to relieve said disks of the pressure of said device.

I 2. In a multiple friction disk device, in combination, coiiperating friction disks, mechanical means for pressing said disks into frictional engagement, an electromagnet for relievin said disks of the prre of said mechanlcal means, and means associated with said electromagnet for causing it to also act upon certain of said disks to separate the same magneticall.

'3. In a multi le friction isk device, in combination, a rame, a shaft, two sets of coiiperating friction disks, one set being locked to the shaft, the other set being locked to the frame, mechanical means for pressing said disks into frictional engagement, an electromagnet for relieving said 'sks of the pressure of said mechanical means, means associated with said electromaa for causing it to also act upon certain of said disks to separate the same magnetically, said disks bein spaced from said shaft to rovide' an axia air passage, certain of said isks being provided with-radial ventilating passa communicating with said space and t e frame having outlets to permit the free discharge of air from the passa 4. In a multiple friction risk device, in

' combination, cooperating friction disks, an

electroma et having an armature on :r P I certain 0 said disks, mechanical means operatin through said armature to press said disks into frictional engagement, said electromagnet magnetically attracting said armature to relieve said disks of the pressure of said mechanical means, and means for diverting a portion of the magnetic flux of said electroma et through certain of said disks to forci 1y separate the same from the remaining disks.

5. In a multiple friction disk device, in

combination, cotiperating friction disks, an

electroma et having an armature engaging certain 0 said disks, mechanical means operatin through said armature to press said disks into frictional engagement, said electromagnet magnetically attracting said armature to relieve said disks of the pressure of said mechanical means, and means. for

- diverting a portion of the magnetic flux of.

. netic flux diverted throu h the same.

6. In a friction disk rake, in combinatron, a frame comprisin a-pair of spaced rings,-a set of-friction ks carried thereby, a rotatable member within said frame,

' a set of friction disks carried thereby to cooperate with said former disks, an annular electromagnet secured to one side of said 1} frame, an armature plate for said electroma \sai' frame to be moved toward said disks et supported between said magnet and r and to be attracted away from the same by said magnet, said armature being provided on one face with a plurality of spaced lugs to engage the outer one of said disks and to concentrate at corresponding points the magnetic flux leaking through said disks, and mechanical means exerting a pressure upon said armature to press said 35 disks into frictional engagement.

In witness whereof, I have hereunto subscribed my name in the presence of two witnesses.

Witnesses:

FRANK H. HUBBARD, LEONARD A. WATSON.

Y CLARK T. HENDERSON. 

